TLR2 and infection: However, in women in whom onset of infection was limited to the second trimester, a significant difference in allelic variation in TLR2 was found (Table 4); rs1898830 frequency of AA, AG and GG was 41.2%, 58.8% and 0% respectively in the transmitters group and 28.6%, 42.9% and 28.6%, respectively in the non-transmitters group.